Filter for bed mattress



FIG. 1 is a perspective view of a filter for bed mattress showing thenew design:

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view showing a state of use thereof.

The broken lines in FIG. 8 are for purpose of illustrating anenvironment of use and form no part of the claimed design.

CLAIM We claim the ornamental design for a filter for bed mattress, asshown and described.